﻿//
// FoldersViewController.cs
//
// Author: Jeffrey Stedfast <jeff@xamarin.com>
//
// Copyright (c) 2013-2021 Xamarin Inc. (www.xamarin.com)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//

using System;
using System.Threading.Tasks;
using System.Collections.Generic;

using MonoTouch.Dialog;

using Foundation;
using UIKit;

using MailKit;

namespace ImapClientDemo.iOS
{
	public class FoldersViewController : DialogViewController
	{
		MessageListViewController messageListViewController;

		public FoldersViewController () : base (UITableViewStyle.Grouped, null, true)
		{
			Root = new RootElement ("Folders");
		}

		public async override void ViewDidLoad ()
		{
			base.ViewDidLoad ();

			var foldersSection = new Section ();

			var personal = Mail.Client.GetFolder (Mail.Client.PersonalNamespaces[0]);

			// Recursively load all folders and subfolders
			await LoadChildFolders (foldersSection, personal);

			Root.Clear ();
			Root.Add (foldersSection);
		}

		// Recursive function to load all folders and their subfolders
		async Task LoadChildFolders (Section foldersSection, IMailFolder folder)
		{
			if (!folder.IsNamespace) {
				foldersSection.Add (new StyledStringElement (folder.FullName, () =>
					OpenFolder (folder)));
			}

			if (folder.Attributes.HasFlag (FolderAttributes.HasNoChildren))
				return;

			var subfolders = await folder.GetSubfoldersAsync ();

			foreach (var sf in subfolders)
				await LoadChildFolders (foldersSection, sf);
		}

		void OpenFolder (IMailFolder folder)
		{
			messageListViewController = new MessageListViewController (folder);
			NavigationController.PushViewController (messageListViewController, true);
		}
	}
}
